An Analysis of Electromagnetic Sheet Metal Forming Process

Abstract

Electromagnetic forming (EMF) is a high-speed forming process that uses energy density of a pulsed magnetic field to deform metallic workpieces. This paper presents a method to calculate the electromagnetic force in thin flat plates using a flat spiral coil as an actuator. The method is based on the Biot-Savart law, and the solution of magnetic induction integral equations is performed inside Matlab®by a numerical method based on discretizing the EMF system in a system of ordinary differential equations that couple the electric and magnetic phenomena. Free bulging experiments and a comparison with Ansoft Maxwell®software are presented demonstrating a good correlation with the proposed implementation.

Strip Size Optimization for Spiral Type Actuator Coil Used in Electromagnetic Flat Sheet Forming Experiment

“…Therefore, area under the curve of magnetic field, eddy current and Lorentz force for each coil was calculated to get a better insight into each coil's EMF efficiency. It is well established that Lorentz force is the net result of the interaction between magnetic field generated by actuator coil and the eddy currents induced in work piece [10]. Hence, Lorentz force is the prime parameter which plays a key role in EMF.…”

“…Li.Qiu et alfocused on the design parameters of coil to get a uniform pressure coil [9]. E. Paese et al presented a simplified method to calculate the electromagnetic force acting on thin flat plates using a flat spiral coil as an actuator [10]. A comprehensive review of this technology was published by Psyk et al [11].…”

Analysis of Electromagnetic Force And Formability of Tube Electromagnetic Bulging Based On Convex Magnetic Field Shaper

“…Through the experimental verification in [14], the electromagnetic bulging of the tube is loaded with a concave coil to weaken the radial electromagnetic force in the middle of the tube, which can make the axial deformation of the tube uniform. The experimental results are shown in Fig 2. This article introduces a convex magnetic field shaper in the middle of the fittings and coils as shown in Fig 1 (b), after discharge of capacitance, the driving coil generates a pulsed strong magnetic field, and the induced current in the convex magnetic field shaper and fittings [15].…”